package contest;

import java.io.*;
import java.util.*;

public class RearrangingSeats {
	public static void main(String args[]){
		Scanner sc = new Scanner(new InputStreamReader(System.in));
		while(true){
			int x = sc.nextInt();
			int y = sc.nextInt();
			if(x==0&&y==0)break;
			if(x%2==1&&y%2==1)System.out.println("no");
			else System.out.println("yes");
		}
	}
}
